Other
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3086..125b&link_type=abstract
In NASA, Goddard Space Flight Center, Climate Impact of Solar Variability p 125-132 (SEE N91-12456 03-92)
Other
2
Chromosphere, Periodic Variations, Photosphere, Solar Activity, Solar Activity Effects, Solar Corona, Solar Cycles, Solar Radiation, Spectrum Analysis, Sunspots, Irradiance, Magnetic Fields, Monitors, Nimbus 7 Satellite, Radiometers, Solar Maximum Mission, Stability, X Rays
Scientific paper
An important aspect in the power spectral analysis of solar variability is the quasistationary and quasiperiodic nature of solar periodicities. In other words, the frequency, phase, and amplitude of solar periodicities vary on time scales ranging from active region lifetimes to solar cycle time scales. Here, researchers employ a dynamic, or running, power spectral density analysis to determine many periodicities and their time-varying nature in the projected area of active sunspot groups (Sact). The Solar Maximum Mission/Active Cavity Radiometer Irradiance Monitor (SMM/ACRIM) total solar irradiance (S), the Nimbus-7 MgII center-to-wing ratio (R (MgIIc/w)), the Ottawa 10.7 cm flux (F10.7), and the GOES background x ray flux (Xb) for the maximum, descending, and minimum portions of solar cycle 21 (i.e., 1980 to 1986) are used. The technique dramatically illustrates several previously unrecognized periodicities. For example, a relatively stable period at about 51 days has been found in those indices which are related to emerging magnetic fields. The majority of solar periodicities, particularly around 27, 150 and 300 days, are quasiperiodic because they vary in amplitude and frequency throughout the solar cycle. Finally, it is shown that there are clear differences between the power spectral densities of solar measurements from photospheric, chromospheric, and coronal sources.
Bouwer Dave S.
Donnelly Richard F.
Pap Judit
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